Abstract
The traditional design method of digital audio parametric equalizer often has spectrum aliasing between two adjacent sub-filters with closed center frequencies. A modified design method for digital parametric equalizer is proposed in this paper. A computer-aided design method is adopted to approach the desired amplitude-frequency responses based on minimum mean square error with the Fletcher-Powell method. The choice strategy of the initial values of the filter coefficients are discussed according to different conditions. Frequency control points is introduced to suppress aliasing due to filter cascade. Experimental results show that the proposed method can eliminate aliasing caused by filter cascade between two adjacent sub-filters.
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